Baffle type muffler with fluid mingling



BAFFLE TYPE MUFFLER WITH FLUID MINGLING Filed Oct. 1, 1948 INVENTOR. Rich are), .6. 7260 ch;

ATTD RN EYE Patented Nov. 29, 1949 UNITED STATES.

F F ICE;

RAFFLE TYPEMUFFLER WITH FLUID MIN GLING 3 Claims.

This invention relates to a muffler, and more particularly to a muffler for a fast-moving vehicle,

such as an airplane.

An object of the. invention is to provide a muffler for an airplanethat will muffie sound produced by the exhaust from the internal combustion engine of an airplane. Another object of the invention is to provide a mufiler that will muffle the soundproduced by the exhaust from the airplane internal combustion engine without causing a loss in power.

A further object of the invention is to provide an airplane mufiler which is extremely simple and inexpensive to manufacture.

Other objects and advantages will be apparent during the course of the following description.

In the accompanying drawings forming a, part of this application, and in which like numerals are employed to designate like parts throughout the same:

Figure 1 is a longitudinal sectional View of the mufiler, according to the present invention;

Figure 2 is a top plan view of the mufller;

Figure 3 is an end elevational view of the mufller;

Figure 4 is a sectional view taken on the line 4-4 of Figure 1;

Figure 5 is a sectional view taken on the line 5-5 of Figure 1.

Referring to the drawings in detail, the numeral l0 designates a housing provided with a top wall H and a bottom wall l2 arranged in spaced, parallel relation with respect to the top wall. Arranged in spaced relation along the top wall II is a plurality of apertures l3, there being a plurality of apertures. M in the bottom wall l2 for the ingress therethrough of air. Dependingly carried by the top wall I l is a pair of converging, longitudinally-extending plates l5 and I 6 which coact with the top wall I l to define a chamber 9 for a purpose to be subsequently described. The plates l5 and I6 have their lower ends spaced from each other to provide a longitudinally-extending opening l1.

Projecting upwardly from the bottom wall l2, and secured thereto, as by welding, is a pair of converging, longitudinally-extending plates 18 and I9 which coact with the bottom wall I2 to define a, chamber 25 for a purpose to be hereinafter described. The plates l8 and I9 have their upper ends spaced from each other to provide a longitudinally-extending opening 8.

Positioned in the housing Ill adjacent the ends thereof is a pair of spaced, parallel partitions 2| and 22. The partitions 2| and 22 are so shaped that they are snugly positioned between the longitudinally-extendingplates and are secured tothe latter, as by welding.- Each end, of the housing I0 adjacent thepartitions, is curved, as at 23, nd closed, there being aconduit or pipe 24 connecting the ends 23,01 the housing I0 to the internal combustion engine exhaust pipe for conveying exhaust gases from the latter to the housing.

Arrangedintermediate the partitions 2| and 22 is a. support 25 provided with a pair of opposed cut-outs 26. The support 25, is secured, as by welding, to the longitudinally-extending plates for preventing vibration of the plates. and, for maintaining the plates in fixed .position.

From the foregoing it will be seen that the housing is so constructed that a longitudinallyextending passageway or throat 21 is provided for the passage therethrough of air.

In the drawings, the arrows indicate the direction of air flow and exhaust gas flow relative to the mufiier when the aircraft or other vehicle is moving forwardly.

In use, the conduits 24 of the vent muffier are connected to the engine exhaust pipes, and the mufiler is positioned so that it is in the slip stream during flight. Thus, in flight, the air flows through the passageway 2! of the muffler to create a vacuum which causes the exhaust gases to be conveyed through the conduits 24 into the chambers 9 and 20, and then be sucked out through the openings 8 and I1 and discharged along with the air passing through the throat 21. Simultaneously, air is being drawn through the spaced apertures l3 and M in the top and bottom walls of the housing It to thereby help eliminate the exhaust noises from the engine.

As many embodiments may be made of this inventive concept, and as many modifications may be made in the embodiment hereinbefore shown and described, it is to be understood that all matter herein is to be interpreted merely as illustrative and not in a limiting sense.

I claim:

1. In a mufller for an airplane engine, a housing provided with a top wall, and a bottom wall arranged in spaced, parallel relation with respect to said top wall forming a longitudinally-extending passageway in said housing for the passage therethrough of air, a pair of longitudinally-extending converging plates dependingly carried by said top wall, the lower ends of said plates being spaced from each other to define an opening therebetween, a second pair of longitudinallyextending converging plates projecting from the bottom wall, the upper ends of said second plates being spaced from each other to define an opening therebetween, there being a plurality of apertures in said top and bottom walls for the ingress therethrough of air, conduit means operatively connecting the ends of said housing to said internal combustion engine for conveying exhaust gases from the latter, whereby forward movement of said airplane causes air to ilow through said passageway to suck air through said apertures and to suck air and exhaust gases through said openings, and a support positioned between said plates and secured thereto for preventing vibration or the latter during use.

2. In a muffler for an airplane engine, a housing provided with a top wall, and a bottom wall arranged in spaced, parallel relation with respect to said top wall forming a longitudinally-extending passageway in said housing for the passage therethrough of air, a pair of longitudinally-extending converging plates dependingly carried by said top wall, the lower ends of said plates being spaced from each other to define an opening therebetween, a second pair of longitudinally-extending converging plates projecting from the bottom wall, the upper ends of said second plates being spaced from each other to define an opening therebetween, there being a plurality of apertures in said top and bottom walls for the ingress therethrough of air, conduit means operatively connecting the ends of said housing to said internal engine for conveying exhaust gases from the latter, whereby forward movement of said airplane causes air to flow through said passageway to '4 suck air through said apertures and to suck air and exhaust gases through said openings.

3. In a mufiier for an airplane engine, a housing provided with a top wall, and a bottom wall arranged in spaced relation with respect to said top Wall forming a longitudinally extending passageway in said housing for the passage therethrough of air, a pair of longitudinally extending plates dependingly carried by said top wall, the lower ends of said plates being spaced from each other to define an opening therebetween, a second pair of longitudinally extending plates projecting from the bottom wall, the upper ends of said second plates being spaced from each other to define an opening therebetween, there being a plurality of apertures in said top and bottom walls for the ingress therethrough of air, conduit means operatively connecting the ends of said housing to said internal combustion engine for conveying exhaust gases from the latter, whereby forward movement of said airplane causes air to fiow through said passageway to suck air through said apertures and to suck air and exhaust gases through said openings.

RICHARD A. NECCHI.

REFERENCES CITED FOREIGN PATENTS Country Date France Jan. 28, 1930 Number 

